If the pressure of the matter is low, as is the case with most forms of matter we know of, then the fate of the universe is governed by the density. If the density of the universe is less than the critical density, then the universe will expand forever, like the green or blue curves in the graph above. read more
Essentially, such a universe would simply expand and contract (or bounce) forever. For astronomers to determine what the ultimate fate of the Universe should be, they would need to know certain information. read more
A type 4 civilization, meaning a Universal civilization would have to worry about the fate of our Universe because it would impact them and they can look at it as solvable problem. But we probably need to reach a type 5 civilization before we can overcome the fate of our Universe. read more